No Bios Post Beep

I am really flustered The other day mouse and keyboard got disconnected. Reconnected and restart comp. Nothing boots to a Intel screen no beeps, fans and lights all working. Tried different hd same checked all connections, changes hd cable. now ready to beat comp. :unch: I don't want to randomly start replacing. Anyone every run across this situation? Could you plz point me in the right direction.